When to re-pitch?

At what point do you have enough RPMs that a re-pitch is beneficial? Would you say that turning a peak of 7320 in 90 degree weather would warrant an up pitch? If so, how many RPM do you usually drop by a one numerical number up pitch?

The ski has a TJ ported 1390 in it and most of my riding is in 90 degree plus temps (South Texas). It currently has a 85mm nozzle on it but I have an 87 I can change at will, just haven't tried it yet.

25 is about max on the DF before you go into point of no return. 26 will bring your rpms down but not much improvement in speed, your paralleling the root at this point. TJ's porting likes to run in the 7300s.